prologues := 3;
outputformat := "svg";
defaultfont := "cmr10";
defaultscale := 1.1;
color Blue,Teal,Orange,Green,Grey,Light,Wash;
Blue := (0,84/255,159/255); Teal := (0,177/255,183/255);
Orange := (246/255,168/255,0); Green := (87/255,171/255,39/255);
Grey := (100/255,101/255,103/255); Light := (236/255,236/255,237/255);
Wash := (232/255,241/255,250/255);
% Format displayed numbers to hundredths using integer strings.
vardef numlabel(expr value)=
 save n,whole,frac; numeric n,whole,frac;
 n:=round(100abs value); whole:=floor(n/100); frac:=n mod 100;
 (if value<-.005: "-" & fi decimal whole
  if frac>0: & "." & if frac<10: "0" & fi decimal frac fi)
enddef;
pickup pencircle scaled .9;
outputtemplate := "MPT-17-004.svg";
beginfig(1);
fill unitsquare xscaled 320 yscaled 220 withcolor white;
% BEGIN DRAWING
path upper,lower,bridge;
upper:=(30,110); lower:=(30,110);
for j=1 upto 120:
  upper:=upper--(30+260j/120,110+35sind(540j/120));
  lower:=lower--(30+260j/120,110-35sind(540j/120));
endfor;
draw upper withpen pencircle scaled 13 withcolor Blue;
draw lower withpen pencircle scaled 13 withcolor Teal;
for k=0 upto 3:
  bridge:=subpath (max(0,40k-3),min(120,40k+3)) of
    if (k mod 2)=0: upper else: lower fi;
  begingroup
    interim linecap:=butt;
    draw bridge withpen pencircle scaled 19 withcolor white;
    draw bridge withpen pencircle scaled 13
      withcolor if (k mod 2)=0: Blue else: Teal fi;
  endgroup;
endfor;
label(btex alternating crossings etex scaled .9,(160,42));
% END DRAWING
label.lft("MPT-17-004" infont "cmr8",(312,210));
setbounds currentpicture to unitsquare xscaled 320 yscaled 220;
endfig;
end.